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Start Stop Holding Field

Publishing Venue

IBM

Related People

Pugh, EW: AUTHOR

Abstract

It has generally been found to be desirable to use an in-plane holding field with bubble devices in order to assure no loss of information during start-stop operation. This can be accomplished by retaining a small DC current in the drive coils, following shutdown, in the direction of the rotating field at the time the rotation is stopped. However, for power-off shutdown, this field would have to be supplied by a battery in order to assure information retention.

Country

United States

Language

English (United States)

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Start Stop Holding Field

It has generally been found to be desirable to use an in-plane holding field
with bubble devices in order to assure no loss of information during start-stop
operation. This can be accomplished by retaining a small DC current in the drive
coils, following shutdown, in the direction of the rotating field at the time the
rotation is stopped. However, for power-off shutdown, this field would have to be
supplied by a battery in order to assure information retention.

This problem is now generally solved by tipping the bubble chip in the
permanent-magnet-supplied bias field so that there is a small in-plane
component in addition to the large perpendicular component. This in-plane field
component (defined here to be the +y direction), when added to the rotating field
of the drive coils, results in a larger drive field in the +y than the -y direction; and
drive fields in the +x and -x directions are in between these values. The
minimum drive field is typically increased by an amount which is approximately
equal to the size of the holding field, the nominal drive field is usually increased
by a somewhat smaller amount, and the operating margins for any given drive
field are reduced. The increased power requirement and the loss of margin are
both undesirable.

To correct these problems, a DC current is applied to the drive coils
simultaneously with the AC components. The DC component should be initiated
simultaneously with initiation of bubble propag...